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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: r
+slug: Web/SVG/Attribute/r
+tags:
+ - SVG
+ - SVG属性
+translation_of: Web/SVG/Attribute/r
+---
+<div>{{SVGRef}}</div>
+
+<p><strong><code>r</code></strong> 属性用来定义圆的半径。</p>
+
+<p>有两个元素在使用该属性:{{SVGElement("circle")}} 和 {{SVGElement("radialGradient")}}</p>
+
+<div id="topExample">
+<div class="hidden">
+<pre class="brush: css">html,body,svg { height:100% }</pre>
+</div>
+
+<pre class="brush: html">&lt;svg viewBox="0 0 300 200" xmlns="http://www.w3.org/2000/svg"&gt;
+  &lt;radialGradient r="0" id="myGradient000"&gt;
+    &lt;stop offset="0"    stop-color="white" /&gt;
+    &lt;stop offset="100%" stop-color="black" /&gt;
+  &lt;/radialGradient&gt;
+  &lt;radialGradient r="50%" id="myGradient050"&gt;
+    &lt;stop offset="0"    stop-color="white" /&gt;
+    &lt;stop offset="100%" stop-color="black" /&gt;
+  &lt;/radialGradient&gt;
+  &lt;radialGradient r="100%" id="myGradient100"&gt;
+    &lt;stop offset="0"    stop-color="white" /&gt;
+    &lt;stop offset="100%" stop-color="black" /&gt;
+  &lt;/radialGradient&gt;
+
+  &lt;circle cx="50"  cy="50" r="0"/&gt;
+  &lt;circle cx="150" cy="50" r="25"/&gt;
+  &lt;circle cx="250" cy="50" r="50"/&gt;
+
+  &lt;rect x="20"  y="120" width="60" height="60" fill="url(#myGradient000)" /&gt;
+  &lt;rect x="120" y="120" width="60" height="60" fill="url(#myGradient050)" /&gt;
+  &lt;rect x="220" y="120" width="60" height="60" fill="url(#myGradient100)" /&gt;
+&lt;/svg&gt;</pre>
+
+<p>{{EmbedLiveSample('topExample', '100%', 200)}}</p>
+</div>
+
+<h2 id="圆">圆</h2>
+
+<p>对于 {{SVGElement('circle')}},<code>r</code> 用来定义圆的半径以及它的大小。取值小于或等于零,圆将不会被绘制出来。</p>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="row">值</th>
+ <td><strong><a href="/docs/Web/SVG/Content_type#Length">&lt;length&gt;</a></strong> | <strong><a href="/docs/Web/SVG/Content_type#Percentage">&lt;percentage&gt;</a></strong></td>
+ </tr>
+ <tr>
+ <th scope="row">默认值</th>
+ <td><code>0</code></td>
+ </tr>
+ <tr>
+ <th scope="row">可变性</th>
+ <td>Yes</td>
+ </tr>
+ </tbody>
+</table>
+
+<p class="note"><strong>注:</strong>起始于 SVG2,<code>r</code> 是一个几何属性,意味着该属性也可以用作圆的 CSS 属性。</p>
+
+<h2 id="径向渐变">径向渐变</h2>
+
+<p>对于 {{ SVGElement("radialGradient") }},<code>r</code> 用来定义径向渐变终止圆的半径。</p>
+
+<p>渐变将以此绘制出来:<strong>100%</strong> 渐变停止点会被映射到终止圆的一周上。取值小于或等于零,将会使用最后一个渐变 {{ SVGElement("stop") }} 的颜色和不透明度,导致该区域被绘制为单色。</p>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="row">值</th>
+ <td><strong><a href="/docs/Web/SVG/Content_type#Length">&lt;length&gt;</a></strong> | <strong><a href="/docs/Web/SVG/Content_type#Percentage">&lt;percentage&gt;</a></strong></td>
+ </tr>
+ <tr>
+ <th scope="row">默认值</th>
+ <td><code>50%</code></td>
+ </tr>
+ <tr>
+ <th scope="row">可变性</th>
+ <td>Yes</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="技术规范">技术规范</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">技术规范</th>
+ <th scope="col">状态</th>
+ <th scope="col">注释</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName("SVG2", "geometry.html#R", "r")}}</td>
+ <td>{{Spec2("SVG2")}}</td>
+ <td>Definition as a geometry property</td>
+ </tr>
+ <tr>
+ <td>{{SpecName("SVG2", "pservers.html#RadialGradientElementRAttribute", "r")}}</td>
+ <td>{{Spec2("SVG2")}}</td>
+ <td>Definition for SVG2 paint servers <code>&lt;radialGradient&gt;</code></td>
+ </tr>
+ <tr>
+ <td>{{SpecName("SVG1.1", "pservers.html#RadialGradientElementRAttribute", "r")}}</td>
+ <td>{{Spec2("SVG1.1")}}</td>
+ <td>Initial definition for <code>&lt;radialGradient&gt;</code></td>
+ </tr>
+ <tr>
+ <td>{{SpecName("SVG1.1", "shapes.html#CircleElementRAttribute", "r")}}</td>
+ <td>{{Spec2("SVG1.1")}}</td>
+ <td>Initial definition for <code>&lt;circle&gt;</code></td>
+ </tr>
+ </tbody>
+</table>